Technician a Says Under Ideal Combustion, All the Nitrogen Entering

Technician A says under ideal combustion, all the nitrogen entering the combustion chamber will leave the combustion chamber unchanged. Technician B says under ideal combustion, all the oxygen and all the hydrocarbons are chemically recombined to produce carbon dioxide and water. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B